Finding the Fourth Proportional to 1,404.42, 1,938.33 and 815.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.42 : 1,938.33 = 815.30 : x
2. Step 2: Convert to fraction form
   1,404.42/1,938.33 = 815.30/x
3. Step 3: Cross multiply
   1,404.42x = 1,938.33 × 815.30
4. Step 4: Simplify right side
   1,404.42x = 1,580,318.03
5. Step 5: Solve for x
   x = 1,580,318.03/1,404.42
6. Step 6: Final answer
   x = 1,125.24